Barbara Londin speaks with geologist Sidney Horenstein about the natural features of the New York City borough of Queens. Horenstein explains how all of Queens' parks lie on top of a terminal moraine, how at one point all of the Great Lakes emptied out through the Hudson River, and the evolution of Queens' wooded areas. Horenstein also talks about the proliferation of plant nurseries in Queens in the early part of the 19th century and the pollution of Jamaica Bay.